. Transactions - American Philosophical Society. nd nearly equidistant marks of growth; substance of theshell rather thin, thicker before; beaks rather prominent, with small undula-tions at the tip; ligament rather short and thin; epidermis yellowish-brown,striate; cardinal teeth compressed, double in both valves; lateral teeth long andnearly straight; anterior cicatrices distinct; posterior cicatrices confluent; dor-sal cicatrices on the under side of the cardinal tooth; cavity of the shell ratherdeep and rounded; cavity of the beaks shallow and subangular; nacre whiteand iridescent. -? ? - •
. Transactions - American Philosophical Society. nd nearly equidistant marks of growth; substance of theshell rather thin, thicker before; beaks rather prominent, with small undula-tions at the tip; ligament rather short and thin; epidermis yellowish-brown,striate; cardinal teeth compressed, double in both valves; lateral teeth long andnearly straight; anterior cicatrices distinct; posterior cicatrices confluent; dor-sal cicatrices on the under side of the cardinal tooth; cavity of the shell ratherdeep and rounded; cavity of the beaks shallow and subangular; nacre whiteand iridescent. -? ? - • Remarks.—Dr. Jay kindly sent me two specimens of this shell some timesince. They were collected by Dr. Bovd, Assistant State Geologist. One ofthem has a few rays behind, the other is without rays. The anterior slope inboth specimens is truncate, so much so in the smaller one, as to induce me tobelieve it to be deformed. It is perhaps most nearly allied to U. ocliraceus, Say. ,,r,Ur U,.^H//.^4u:;^^^/^,,;^ /,/&,)>///?: ?d2, i.
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